>>>>> "Neil" == Neil Williams <[email protected]> writes:
> Error handling is the main reason. Unpacking might fail, the archives > might be the only source of data. > Could you have a look at the current SVN revision and let me know how > that matches your tests? I'm going to have a look at it and test this stuff on friday. >> That's exactly the problem: inconsistent versions in the archive or >> archive updates while multistrap runs. > That sounds like a broken archive. > I haven't implemented the versioned source call - I remain unconvinced > that a valid archive would cause the download of a source package of a > different version to the binary package. Are you assuming a non-changing archive? As soon as the archive changes non-atomically (with locking applied by the client) I think we're doomed. As we're building images from debian sid, changes will be pretty common. I'm not sure how many times 'multistrap' performs 'apt-get update'. Even if it only does it once, the source and binary package indices are distinct files, and they are retrieved by distinct transaction from the ftp/http server, so I see no way that you can guarantee consistency during mirror pushes. The only atomicity you have is for updating a single index file via 'mv'. The following scenario: * mirror gets updated, probably first new files put into the pool, then the new indices follow, then even later, it's going to delete the files no longer referenced by the indices. * Concurrently I run 'multistrap' which runs 'apt-get update', fetching dists/sid/main/binary-amd64/Packages.bz2 and sid/main/source/Sources.bz2 . * Now I get Packages.bz2 from before the mirror update, and Sources.bz2 from after the mirror update. Sources.bz2 is going to have some packages updated to newer versions, and won't correspond 100% to binaries from Packages.bz2, thus violating the GPL Of course I guess the error rate will not be too high, at least not over a normal high-rate internet connection. cheers, David -- GnuPG public key: http://dvdkhlng.users.sourceforge.net/dk.gpg Fingerprint: B17A DC95 D293 657B 4205 D016 7DEF 5323 C174 7D40
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